Cold Work and Spot Repair options

Introduction to Cold Work and Spot Repair options

Cold work is defined by tools that do not generate high heat. Spot repair involves removing damaged or deteriorated parts of the coating and the associated contamination, followed by replacement with a new coating. This helps to extend the life of the coating system with minimal intervention.

Spot repair maintenance on coatings is a constant process. In actual fact, it is a necessity to ensure the coating system is performing optimally and protecting the underlying asset substrate.

Read more about spot repair here: Do conventional grinding discs hurt more than they heal?

Cold work tools – Micron (μm )

The wolfram-head of Safety Tools cold work grinding files have different teeth to produce a different surface profile. μm (Micron) In steel and other material. Knowing the tool’s surface profile, it is easier to plan the best paint/material to choose for repair.

An example is taken from a case study from Perspect, Leakage of air line.
We see that by knowing on forehand that the Little Papa grinding file has an average surface profile of 83 μm. They knew that this was exactly what was needed for the repaired product.

Surface profile

Not everything is about the surface profile. Surface cleanliness also matters.
They are, in fact, very independent of each other. So in effect, you could have a high surface cleanliness standard. Say, ISO Sa3 with a shallow surface profile of 25 μm. And the reverse is possible as well. A lower surface cleanliness standard of ISO Sa2 with a high surface profile of over 120 μm is possible.

As regards Surface Profile, steel surfaces are being prepared for shop primer, for example. It needs careful consideration on the surface profile being achieved. As well as the abrasive used to achieve it. The incorrect specification could lead to premature failure.

If you want to read more about the subject: Surface Cleanliness vs. Surface Profile.

Commonly used methods

Commonly used methods in the industry include Abrasive blasting – Wet/Dry, Chemical Etching, and Power tools. If the project is being done in-situ and does not allow Hot work, it narrows down your options considerably.

Cold work – Surface preparation tools

Ex-certified cold work surface preparation tools from Safety Tools Allmet will give a good clean surface with a profile, meeting the SSPC-SP11 Surface Preparation Standard requirements. This standard is suitable where a roughened, clean, bare metal surface free of all visible oil, grease, dirt, rust, coating, oxides, mill scale, corrosion products, and other foreign matter is required, but where abrasive blasting is not feasible or permissible. Lastly, the peaks and valleys on the prepared surface need to form a continuous pattern with no smooth, unprofiled areas.

A-0044 Limited edition website / Spark-free grinding

The example shown is the 2021 Spark-Free Grinding Kit (Limited Edition)

Save time by eliminating demanding risk assessments and costs related to shutdowns, fireguards, hot work permits, habitats, and demanding cleanup work. This kit contains everything you will ever need for surface treatment. The air tools, grinding files, and grinding disc are Ex-certified as safe to use in ATEX gas zones 1 and 2 and ATEX dust zones 21 and 22.

Rotating files and discs

Safety Tools Allmet files and discs are made of tungsten carbide. The hardness and the design of the teeth increase the lifetime of files and discs significantly. The fragments produced after grinding with Safety Tools Allmet are easy to clean, large, and blunt. This offers many safety and operational benefits compared to conventional tools.

Spot size and our spot size standard

The size of the spot areas can be vastly different from each other. When we talk about spot repair, we often size them as 5x5cm areas.
The reasoning behind this is that we can easily show the estimated lifetime of our grinding tools.

Take, for example, our A-0001 grinding file. This grinding file has an estimated lifetime of 8000 spots, and this is 80005x5cm spots with an average of 76 μm surface profile.

A-0001 - Slim slipefil / A-0001 - Slim / Grinding file for tight areas

Spot calculator and price per spot

Calculator for finding the price for one spot (5x5cm) This tool can help you to compare prices and offers to find the best one for your job.

When calculating the price per spot, we use the following formula:
Cost per spot = Rotating file + air tool / Number of spots rotating file repairs

Link to our spot calculator.

So… Where can I use Safety Tools Allmet

You can use safety Tools Allmet Cold work equipment instead of conventional blasting methods.

Our “Cool” technology is used in many sectors, including the oil and gas industry, the petrochemical industry, steel construction, and shipbuilding. As well as during maintenance work on bridges, offshore installations, and wind turbines.

Read more about our cold cutting technology here.

Proposed application areas:

Corrective maintenance on platforms

Corrosion maintenance on ships

Engine room surface maintenance

H-beam surface maintenance

Mechanical maintenance

Remove coatings from valves

Remove corrosion on stuck small bolts

Topside corrosion maintenance

Flange separation preparation

Grinding and surface preparation on live fixed pipelines

Inbetween narrow openings (Grating)

Pin hole corrosion

Remove coating in layers

Remove corossion from valves

Remove or smooth edges

And many more